Carbureter.



T. J. D'I'3TURNAL.

CARBURETER. APPLICATION FILED JAN. 11, I916.

- z SHEETS-SHEET! J' Z Patented Nov. 21, 1916 T. J. DISTURNAL. CARBURETER. APPLICATION mzn JAN. n, 1916.

1 ,20 5 ,602. Patented N ova 21, 1916.

2 SHEETS-SHEET 2- THOMAS JOHN DISTURNAL, OF BELMONT, IRELAND.

CARBURETER.

Specification of Letters Patent.

Patented Nov. 21, 1916.

Application filed January 11, 1916. Serial No. 71,497.

- To all whom it may concern Be it known that I, THOMAS JOHN DIS- TURNAL, a subject of His Majesty the King of England. residing at Belmont. in the county of Kings, Ireland. have invented certain new and useful Improvements in (arbureters for Internal-Combustion Engines, of which the following is a specification.

This invention relates to improvements in carbureters for internal combustion engines.

The object of the invention is to provide a carbureter by means of which the consumption of fuel is greatly economized when working at varying loads. a perfect explosive mixture can be obtained under all conditionsof working of the engine, and the ratio of the throttle opening can be adjusted to suit the difl'erent requirements in accordance with the ratio of the choke tube area, all in improved manner.

The improved carbureter constructed according to the present invention.is fitted with two cooperating ported sleeves or cups, one or more choke tubes, each having. a free fuel supply nozzle cooperating therewith, and a separate choke tube control valve mounted upon the tube or tubes, said sleeves or cups serving as the main throttle valve of the carbnrcter, and said control valve serving for varying the effective area of the choke tube or tubes, said throttle valve sleeves or cups and said choke tube control valve being adapted to cooperate with one another to control the explosive mixture passing from the carburetor to the engine.

A suitable manner of carrying out the invention is hereinafter described with reference to the accompanying drawingsin which Figure 1 is a part sectional elevation of the complete carburetor. Fig. 2 is an elevation of same, and Fig. 3 a plan of the carbureter showing the upper portion of the casing removed. Fi s. 4 and 5 are plan views 'of the choke tu e block and the choke tube control valve respectively. Figs. 6 and 7 are partly sectional elevations of the outer and inner throttle valve sleeves or cups, respectively, showing said sleeves or cups as if spread out.

A plurality of fuel nozzles a are disposed within a cylindrical or other suitably shaped casing 6 into which cold atmospheric air and or hot air, or, if desired, air under pressure may be admitted through one or more suitable ports 0, it being understood that these ports may be valve controlled if desired, and a corresponding number of choke or carbureting tubes d are positioned above and around the nozzles and also within the casing. The nozzles a are u-et'erably fitted on a common two-part fuel supply chamber 6, one part f of which chamber forms the bottom of the carbureter casing while the other 9 is removably secured thereto, and the choke or carbureting tubes 1] are preferably formed by shaped holes or passages provided in a solid. and separate aluminium or other metal plate, block 72 reniovably secured within said casing by means of a set screw 71. and packed by an india rubber, cork or like ring if.

A flat disk or plate alve '17 slotted at i is mounted within the casing Z) and immediately on the choke tubes (Z so as to leave no air space between said valve and the tubes, and is adapted to be turned in its own plane to control communication betweenthe tubes and the throttle valve and engine.

The nozzles o are ar'anged in a circular series, and the choke tubes (Z are preferably graduated in size and so arranged that the pilot nozzle (1. and the smallest tube (1 are opened first by the movement of the disk valve 71 and so on to the largest throughout the series. The pilot tube and nozzle would be entirely cutout before the last and largest tube and nozzle are fully opened.

Two cooperating man throttle sleeves or cups j and k are disposed between the choke tube control valve 2' and the induction pipe of the engine, and are adapted to be operated in conjunction therewith to vary and regulate the explosive mixture at will ac- The two sleeves or cups 7' and 7c are fitted one within the other, and the outer sleeve is formed with two or more opposed elongated half diamond or other suitably shaped holes or ports 1" in its walls, and the inner sleeve with similar ports ]0'. The. top or open end of the outer sleeve or cup is, an air tight but working fit in a pipe Z adapted for connection to the induction pipe of the engine, while the innersleeve or cup 70 is an air tight but working fit in saidouter sleeve or cup. A hollow stem oi" tube m is formed or fitted on the closed end of the outer sleeve j and is extended outside of the carmen...

' speed, but if it is required to reduce speed bureter casing and fitted with a manually operated lever 92, and a spindle formed'or fitted on the closed end of the inner sleeve, extends through said hollow stem or tube and is fitted with a similar operating lever p. It will be understood that the lever n may be automatically operated if desired.

The portion of the stem or tube m situated immediately beneath the outer sleeve or cup 7' is fitted with two pins or other projections (1 which are adapted to operate the choke tube control valve 11 and are made a fairly loose fit within suitably shaped slots 7* formed in said valve, so that the pins or projections allow the outer throttle sleeve or cup j a lead in its movements in either direction before moving the control valve 2'. The object of this arrangement is that when the outer sleeve is turned a little to open the two ports 71: formed in the inner sleeve Ir, the opened portions of the ports are increased in area before the exposed area of the choke tubes 1] is altered, and again, when said .outer sleeve is being closed, the ports are reduced in area before the exposed area of the choke tubes is reduced, thus by varying the ratio of areas, adding greatly to the acceleration and flexibility of the engine, at the same time causing considerable economy in tuel consumption when the engine is working at varying loads. When the inner sleeve or cup I: is turned within the outer sleeve j by medium of its spindle 0 and lever p, the halfdiamond or other ports is therein can be brought into registration with the ports formed in the outer sleeve or .cup, thus fully opening the throttle, and if it is turned in the opposite direction the ports can be fully closed. Also if the inner sleeve or cup I; is held rigid and the outer sleeve or cup j turned thereon by medium of its stem or tube m. and lever 11., the half diamond or other ports therein can likewise be either fully opened or fully closed. When the valves 2', and A; are fully closed the pilot jet a and the tube d remain uncovered as shown in Fig. 4, thus providing an initial opening to the engine.

The arrangement of a slotted plate such as 2' mounted immediately upon the top of the choke tubes without the addition of the two sleeve valves y and It: would be practically'ideal for starting an engine, running dead slow and gaining or maintaining quickly and frequently, this arrangement is not sufiicient, as by closing said choke tubes by turning said slotted plate back to its original position the suction upon the small choke tube d and pilot jet 0 left uncovered would be terrific, until the engine has slowed down, thus causing waste of petrol during the said slowing down. To entirely eliminate this disadvantage the double sleeve valve j: employed.

The larger or outer sleeve 7' is really the main throttle for the engine, and is so arranged that it alone, in its movements, controls and actuates the slotted plate a, but it' is given a lead in its movements in both directions before moving said late as above described. Thus it will reach y be seen that by closing this throttle sleeve the engine suction is retarded on the choke tube area before said sleeve begins to turn the slotted plate which covers the choke tubes and the sleeve is completely shut excepting for the pin prick hole 8 by the time it has closed the slotted plate over the four larger choke tubes (Z; thus the mixture is kept economical in the slowing down of the engine. The lead movement is calculated and fixed when tuning a carbureter up to suit any particular engine it may be fitted to, and the size of the small pin prick hole 8 formed in the engine requirements. This pin prick hole is provided to allow a very small amount of.

the mixture to pass when the throttle is fully closed, so as not to stop the engine completely in. trafiic, and to obviate the racing of the engine when starting. It is placed in any part of the wall of the inner sleeve k which may be opposite one of the outer sleeve ports j when the throttle is in closed position. The lead movement of the throttle sleeve j also has the advantage of obviating the retardation of suction on the earlier choke tubes in the converse or opening-up operation. The object ofthe inner sleeve or cup ]!i is to give complete control over the regulating of the mixture as desired, according to the warming up of the engine and other requirements. The ports is are opened and closed according as the outer sleeve j is turned, the inner sleeve being held rigid by its own separate control. By turning the inner sleeve slightly by its control, the size of the ports is can be made larger or smaller as desired. When and as desired, after the engine has warmed up to its work, the inner sleeve or cu can be turned a little so that the ratio 0 the area of the ports may be reduced to any required extent in comparison to the exposed or sub-- sequently Zexposed area of the choke tubes, and this reduction in the ratio is maintained constant so long as the inner sleeve is kept rigidat any desired position, no matter what way the outer sleeve is moved. This really means that after running some time and the engine is warm, there isby this arrangement, a larger choke tube area exposed to the suction 'to give the same volume of the mixture to the engine; as by opening the ports to admit a certain volume of the mixture there is a larger choke tube area ex posed than there was previously, which naturally means a weaker mixture this being the chief desideratum after an engine is hot.

actuated to cover and uncover said tubes,

and two sleeves mounted one within theother -and adapted to be actuated independently or simultaneously to cooperate with each other and with said plate to control the carbureted air.

3.' A carburetor comprising a casing, fuel supply nozzles, carbureting tubes to cooper ate with said nozzles, a slotted plate mounted immediately upon said tubes and adapted to be turned in its own plane to cover and uncover said tubes, and two cooperating ported sleeves mounted above said plate and one within the other and adapted to be turned axially independently or simultaneously to cooperate with said plate to control the carbureted air.

a. A carburetor comprising a casin fuel supply nozzles, carbureting tubes to cooperate with said nozzles, a disk or plate adapted to be actuated to cover and uncover said tubes, two sleeves adapted to be actuated to' cooperate with each other and with said plate to control the carbureted air, and an operative connection between one of said sleeves and the plate whereby' when said sleeve is actuated it also actuates the plate.

5. A carburet-er comprising a casing, fuel supply nozzles, carbureting tubes to cooperate with said nozzles, a plate adapted to be actuated to cover and uncover said tubes,

two sleeves adapted to be actuated to cooper- I ate with each other, and with said plate to control the carbureted air, and means operat'ively connecting one of said sleeves with thev tubes, and two ported sleeves adapted to cooperate with one another and with said plate to control the carbureted air, the slots in the plate and the ports in the sleeves being of such sizes andarrangement that the carbureter is provided with an initial opening to the engine when the plate and the'sleeves are in their closed positions.

7. A carbureter, comprising a casing, fuel supply nozzles, carbureting tubes to cooperate with the nozzles, means adapted to be actuated to cover and uncover said tubes, twosleeves mounted one within the other, a hollow stem or tube on the outer sleeve and extending exteriorly of the casing, a spindle on the-inner sleeve and extending through the stem of the outer sleeve to the exterior of the casing and means connected with the exterior ends of said stem and said spindle whereby the two sleeves can be actuated independently or simultaneously.

8. A carbureter, comprising a casing, fuel supply nozzles, carbureting tubes to cooperate with said nozzles, a plate adapted to cover and uncover said tubes, two sleeves mounted one within the other and Within the casing, an operative connection between the outer sleeve and the plate and means whereby said sleeves can be actuated independently or simultaneously and the plate be actuated with said outer sleeve to cooperate with each other to control the carburet-ed air.

signed my name to this specification.

THOMAS JOHN DISTURNAL.

In testimony whereof I have hereunto 

